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What is index in SQL?

Select the correct SQL index definition from the options below:

An SQL index is a built-in search function within the database software.

An index in SQL is an ordered data structure that allows the database to find the desired rows based on the values of the indexed columns without scanning the entire table. In most cases, an index speeds up data retrieval but slows down data modification by adding the cost of updating the index itself.

An SQL index is a mandatory component for every table in a database.

An SQL index is a duplicate copy of a table stored in a separate location for backup purposes.

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SQL Essentials for Data Analysis: A 50-Day Hands-on Challenge Book by Benjamin Bennett Alexander

SQL Essentials for Data Analysis: A 50-Day Hands-on Challenge Book by Benjamin Bennett Alexander

If you’re wondering whether you should learn SQL, the answer is simple: absolutely. SQL (Structured Query Language) is the language of data, and data powers every modern business. Whether you’re a data analyst, data scientist, business analyst, software engineer, financial analyst, product manager, or marketing professional, SQL helps you retrieve, analyze, and understand the information that drives decisions.